1-2 ohms between terminals should be allright. Did you check the voltage at the clutch wiring harness plug? remember you need someone on the seat even if the engine is not running to get voltage to the clutch. t Next try a jumper wire from the + side of the battery to one terminal and ground the other clutch terminals, careful to not let them touch see if the clutch kicks in. Also check your ground wire ohms at the plug make sure it has not broken inside the wire covering.
I had a older machine that was not charging, the owner changed out the voltage regulator, generator, and battery he was starting to change switches but gave up. It took a little time with a meter but I found one of the wires were cracked at the voltage regulator. It looked fine but no continuity I pulled it and the wire covering was the only thing holding it to the terminal end. I replaced the terminal and worked fine.